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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1256e9ce7eff67256d69d33c9dda903055c934968190428c71b59d78bf894a4' 
  AND token = 'hu+i5ti6qs/VkZb8P16rNQL/oxtaeCujnl6Xd6Jldqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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