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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fde29c0b5fbc2552674aecd2c1087a95f4d5784143fbcb0852b5d8ad37df416' 
  AND token = '1TRY5GWgcqQkHk7eFGgXtRC5rtMEKgR8YI2o52VVJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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