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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68ce81eb921850cfc1128e70f6ed2266f0800569745ced252519fb889f98913' 
  AND token = 'gBs4w5WqJpOiRLo4VyDNukfrdf32h85G+KNFKcXX2Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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