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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9a0532eb4573125a928f6de02101d923adfdee92cbe6bdc8da829582ba9055' 
  AND token = '7tE0qUxkrqNwM2uOKeYGq8PDXQKc90inX25j4iyBVxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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