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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bf288017896c255c2faaa0aea51589c55451a427aa18e584433299712483f7' 
  AND token = 'luN4ZewUlQtr+1ROSLf3Bdw4UPKdf/F96jvOvOqq8qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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