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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf8a878a651e905f0b6aa49d4249e4f94788899b5dd48260765dfac5a22d947' 
  AND token = 'Aa3up6BsptefKbV5fe7wlORak+VGWYp0zm26kAeKNBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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