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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca8e2e9b79c5d10543bc512f96bdd3cef17a120d47ab0919926b922a3aadeef' 
  AND token = 'QjiPOouwvC7UVy+t5KSb2YEtMYW/QVHh0sFCP7uFqfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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