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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2c2723f25cfd741f25c6358f2e0ec471d2bd5d878d720e980cf14c8b519f1d' 
  AND token = '0qkrtC/y3zwxpgrCGaS79565p+cm/4ZgIWJm1DcVOZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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