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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154dea44206091c4cab552ece19fc2210cccc0fef29da595f6a2c3121158681c' 
  AND token = '8HPRw/vbbWuTOrTBNQyCOXgFoVDzydsMiYWQ6A5z6kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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