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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3e9e417e6182762b0696b9f425e4dac3ba1fbb1572f10ef4d3685424bed812' 
  AND token = '9k0zTzJUElTLX4c6EK1gyCERv5e2l5fZybi9kYuWhn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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