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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f0e4579711229e7e3a3d0073cf385c99f5649f04a8979e1d021ae62b6132f' 
  AND token = '7BycaHHomfmrQWBKps9qfNFUZt+WTc8yrLBFGSf79cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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