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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52da7d8416ac4591a2b7addbdc8264330acd2574abdf5f1ae7af88fc5d468f18' 
  AND token = 'b4eSqnXzAe+izl7zvR1qcW4IrveBCL7oRujOjPYr/DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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