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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd620b8917bf75e278f9ef02df7753737f8fc099516b2c5d78508cd452070ce0' 
  AND token = 'bHG1YP76/R5bz6x+C++d9YbwGPWNMXeJoVBsYhLB2Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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