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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b67152d1679dd1162978812a0cd76a3d68f62b02dd826d384d3196fccab6a3' 
  AND token = '0//vdRNWV9I7IEVkqMAdef+CgIPWP/82F18S44us3Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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