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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b851838e7886f31e4f610957b66ed5bcd0d36b34ac309cc46d2f08f0512db6' 
  AND token = 'LcL+C6lcaFkG0coY66W51CYMGOfB40+lIvIyDR9OFpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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