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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edd1dbc2b9f8b925d87ab12617a6042ea1c41e8c01d6bd5563bcdb900feb735' 
  AND token = '5gFzGAq81nRBd4jgaNlbYiua45Kar2hM7teTgQqghrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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