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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c444eb2d7a6dc437c3e611fdac155b04391868b1540438a86ad630b6166d1acf' 
  AND token = 'k6AhZYynFx+AmclMDadrhFled8H0Y+9lcZtNM24M0b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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