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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41aa3f88584bed69aa2edcd6a12e053b3ae5837e399cac04bb71fbb43f0bd2b4' 
  AND token = 'OmaRbHr4wTDo4/A3r5sGdACsCsiOuSfccBbgg+zJQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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