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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d23349d35e54a7f6d134dc4c1ae9317aa4388b73cbc00c31d0653c2952cdeb' 
  AND token = '6tibDDVw5NDmfCEB4wSn2KebF7ilkmjmHRyG7bXjigw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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