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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d56e928c1393f2ba54934fbb859df578e7ca0e1b33f4abf74c87e74aebe28f7' 
  AND token = 'mEYx7EEBT44kj/1Y7PfGWXwV99d8roSyy2eNkgMj0LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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