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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46be36808322ea0eac4000fda37b1feb2b09f357ba4b22dfc0fabb4e7d98fef8' 
  AND token = 'PkO5OEml6EAVITytI/ojdGoiwKPeg9i65qv5gimpTOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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