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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0623e13aed20f971211e7ab36f9578015a073e891d6bbb4e9383d753f8aeca1' 
  AND token = '3Y0Ond/rtvAewxMEhtK4b+DG9H6C1lYzr6fqTLwt2cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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