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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afb118d760c79e65306b8e60ac1753b7793fc7e257bc1617953f5ef8d43c4d0' 
  AND token = 'xl1ZBH8JdSt4Fhq+ZUeq4cP1gHLI9jLyOyY+0SDzboc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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