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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e87fc4c3cf6e6d3bb1082236e7a7f688bd951792f66c4073a03893c6aad1588' 
  AND token = 'RW7FjbC0cw/U+6/Bk+TWtUAOD1EwaUYI9CsimfyTfBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}