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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f0180e83d9f0caae3214dbfe0590082f63a89cbf0b780b664b99162d45d3d1' 
  AND token = '3gSl095OuUpo77PwczsRl5NaF/Jti6bzcpFR1uxxg6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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