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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed29456c763cedc6a4b8e914c172eefc9b6c44cb9487547012768ad7807c90e2' 
  AND token = 'zNxc0ld9bwx+spi6tdXc88S5cYDwHBzaWXbCactGA5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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