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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ff83d2350d5ac55ad76ae9789d23386927c4a1363b12a27653b318485623d7' 
  AND token = '8yWk+9+Xq0y3R1VK8bxWx6izfqY5QrUUFGSb285J4YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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