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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2596f6a40408946575ef53acadcc946f757c6e992872d538bab09c55e88245' 
  AND token = '5SMmhn5qGnwkvPvFyiLObgkEfCJnM8fLOQHcx255yeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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