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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82258be88687b47dc5d24a61a1011808c35c73f3acdaf3a0b302c63528e3c00' 
  AND token = 'FTGPt1aTbo5KxzJBP/tNE3cn75qUsUHb2lkl2zs3xe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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