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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c4a449b4bd6c81d7cb4a0dc0faab5e0aa6e85b2e248aec5998c9010f81094a' 
  AND token = 'iDy/RNPFE9XG/OThRz2CSj6fHkNiynPyrpqw6Hm0fO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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