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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61d6a0cc1ca3c11b69c7cd60684e46417debcfe0b68d98faa172f309dbc75a1' 
  AND token = 'LM7sT7h+BY96GdQNjVKGSMkpxRG4Xc54/+iKleluLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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