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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93e64ad018d380c196fcd560cc17e95f865ed14ffb082a14bc404664b4cf350' 
  AND token = 'h2KbinR9s9X3foo/ELcSKALxG/QdfQGne547OpZdoVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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