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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2bcd3a1e020d07a538c3c954114bd3de8e5a92cc5a2f85383cfcf0da2d2c85' 
  AND token = 'BwYGFqZ8C03kaDrLUNj/jV+svb+ZEt4cT8MRG/bbbhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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