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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa5ad3a10414011dcfdd27aff9754bb5e57067bfbdae393074029d0462ab259' 
  AND token = '0tYK8egLlOaSwYXuj+LT2cg5pq0CIaFTaCbrYdu6L/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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