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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223b5195dbde2457aed68fd5c55cd294c727a0b98dcc9e27d422064fd43fe592' 
  AND token = '/+kK1gTaiRx1V4Qk3D1kevkf0sNaCRQKIWrrCoCEOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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