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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fee464398a47e0f06608936ae4dd91a97d513bef3ff0cba07d0b2ef1e487053' 
  AND token = 'moni4oSjO8bdna/gWH1ES2kgqlH7ob58Phl5YcLlB+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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