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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72aaeb70352668bc6be31d5c562875bd23a0acd40c13ac0e68fb4602ef51c722' 
  AND token = 'TSHNnERD9xYF+ORLp+YHC6m4StQwQ9YKw/HGn8dbEHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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