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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0238e7eb6a5a6786991ba07e21ccb124642671e2bebda53e92150076812e5d1' 
  AND token = 'Cd9fjJXa5AWWcelaqjTqncyzLkHzRyHUS3VCORozdb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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