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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f4aec8fca36ddd75c31dc069248912601bfffebbdf9ea422934ef268755ee4' 
  AND token = 'bISJSaoH618DiCSsdfg4zB+X1P3Bx3Yg0PeEaleFb6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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