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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2be308f907c3b96ea1f8793a665b3694ae7751e4ca6184024e85f6db5c06301' 
  AND token = '+CSwuaZBMhKmsP3yflA67Iy7686zKi0tU97dK2/KJDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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