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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e0a826d7a246f0fd5a1618293a99585b1e7f92956c4cecc2a208006591bdba' 
  AND token = 'A7vOaBkUQt+VSFYc3O7p4KC5stk/ZIj104khIWT/aB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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