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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c93b75cd32c4b54c03a0c29d4acc5f888406ccfdae1cba54e16f46860318b' 
  AND token = 'j9HUf34lCr+gxkrR0VeyYc74EhyUZ/mdS3DaL7rOX1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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