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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cb67c6fde90386282d5a55d1568f1ea98abe8d6cb13bdbb176ed4aa83158f1' 
  AND token = 'M/oKawpmhDSS8LxHkXaDLBHHzOOr4bw047jkRA0ic6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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