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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5670645fb331f42d4d45d8bf83524d2959a48d0ba690a0fdcf5ad8192bb3268' 
  AND token = 'jei5M95sMOXfCz3b26oM390HRGhQo55gN9OBP23Znww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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