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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60fe3140f0d6361e9e74728050c33f8156938fe47cc0792c0fcb4fda8222d5' 
  AND token = 'r7ikiPwJsLOYMVQkj65SgaTEgNoPPL2/Gy4HN4rjx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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