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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b046448e7378f016ee4cbf3ea9348b911a0d6a93131e68a1db4d4dc1dd2ab5' 
  AND token = 'aHYtNzsDUlv3UrDbmWKBv0R9rQInPxRJjQGMday3RIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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