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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a73fc627aeda5e74877b1f186497d46a9f3a57ec430926928d53960c4fecc4' 
  AND token = 'jhKiba9DHEyQ8us55lVSenEt146cWZ5S2HD69LIlreA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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