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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a56c707afd10861528fa237c44246a6fdf932fa3c84dd8d0c4260172be4ded' 
  AND token = 'obSNZBcuycJBc3fY9HbXmDG8wZobHCslwCtC0ATy1kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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