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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58da49a38821f6f09c0316bfda1d2ecfb45a770b0d75e1d4e99161d79292712' 
  AND token = 'wJ873z/Gm+T7KrK74dT+5D7FCk7zHd1BbqznKXmRcQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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