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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16e01c1b35126ea1806e800fc1a3820b9cffaf66c6e52acd7a9d77703ada7b3' 
  AND token = 'JVPQCHBh+9Sruv232J9QBcHK52jZEw588kWc3FOTp3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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