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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ca769c197b2f463bddf13b95ca612878886c42903331b220fcbc87329bea91' 
  AND token = '4maJa9mxEIRcUG4h4lnaRJs+MNVM8GJMho/TST8QV+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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