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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c64a62abbe6fbed02ae9943110b1902252c244dd0d579e062cac2bc581db59' 
  AND token = '52Vpr1lPXPj+rKxvSj0oa1c7yQt2MB3GVRv04GBHgVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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