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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c2916b8c96da56409ac1ef1d40a8b0e2a0cb038c8fd6ac4139ea5d1d26ba3f' 
  AND token = '+zGxnlE54mY2fRbh3NteXPoj7A+7dP2in1ppEktDick=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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