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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682251152420dc7aa1a0bd4b4f8ccffbbe9d4910b45f22d3780b7d8017e61327' 
  AND token = '6yO/PTkxk5g/MHng5LsuqFbE0jlCU4FPrzX4EQnO+KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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